Limit of localstorage on iPhone?

"The current default on iPhone is 5.0 MB. If your database grows beyond this limit, the user will automatically be asked to allow or deny the size increase. If he allows the increase, the database size limit will be upped to 10.MB"

Source: http://ofps.oreilly.com/titles/9780596805784/ch05_id35816678.html#ch05_id35933214

on January, 2021

Chrome and Safari over iPhone cant save more than 2750 Kbs in a localstorage var.

    //HTML

    <div> The localStorage limit is <span id="size">???</span> KBs. </div>

    //JS

    function gen(n) {
        return new Array((n * 1024) + 1).join('a')
    }
     
    //window.localStorage.clear();
     
    // Determine size of localStorage if it's not set
    if (!localStorage.getItem('size')) {
        var i = 0;
        try {
            // Test up to 10 MB
            for (i = 0; i <= 10000; i += 250) {
                localStorage.setItem('test', gen(i));
            }
        } catch (e) {
            localStorage.removeItem('test');
            localStorage.setItem('size', i ? i - 1 : 0);
            
        }
    }
    
    
    var el = document.getElementById('size');        
    el.innerHTML = localStorage.getItem('size');

There is a great way to tell the limit of your browser...

http://dev-test.nemikor.com/web-storage/support-test/

Mobile Safari on the iPhone and iPad will hold 5MB before throwing a QUOTA_EXCEEDED_ERR when using localStorage. If you're using HTML5 SQL, the user will be prompted at 5MB intervals to increase the storage limit.

Desktop Safari v4 does not have a limit, afaik, on localStorage. However, Safari v5 limits the site to 5MB before throwing a QUOTA_EXCEEDED_ERR, exhibiting the same behavior as the mobile version.